RX - 4th Gen (2016-2022) Discussion topics related to the 2016 and up RX350 and RX450h models

Tow Wiring? Non Tow Package Model

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Old 05-02-16, 10:53 AM
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daveylin
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Default Tow Wiring? Non Tow Package Model

So I went under the car just to see if there was any pre wiring in non-tow package models, mine is a F-sport / No tow package.

I found this plug inside the rear bumper on the left... is this the tow lights pre wiring?

If I got a hitch would I just plug the lights on the trailer into this?

Old 05-02-16, 11:02 AM
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RXOwner
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The trailer will not plug into that. It might be the connection where the wiring harness goes that has the trailer connection on it.
Old 05-02-16, 11:12 AM
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daveylin
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Ah you are right I think... so it seems the pre wiring is there even in the non-tow package equipped models which makes me happy.

It looks like it fits this.

https://www.etrailer.com/Custom-Fit-...id=20161174043
Old 05-02-16, 12:23 PM
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Originally Posted by daveylin
Ah you are right I think... so it seems the pre wiring is there even in the non-tow package equipped models which makes me happy.

It looks like it fits this.

https://www.etrailer.com/Custom-Fit-...id=20161174043
No doubt. Enjoy.
Old 05-02-16, 05:38 PM
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toyotaman7
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You have the wire, but likely no power. There is a converter box inside under the passenger side luggage compartment trim that is likely missing. You also do not have a transmission and engine oil cooler. I would not tow without a transmission cooler.
Old 05-02-16, 06:01 PM
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mcomer
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Non tow packge RX's were rated for 2000 lbs., 3500 with.
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Old 05-02-16, 06:06 PM
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toyotaman7
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Originally Posted by mcomer
Non tow packge RX's were rated for 2000 lbs., 3500 with.
Double check that. The owners manual says that without tow package the car is not rated for towing at all. That might be a change for 2016.
Old 05-02-16, 06:10 PM
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daveylin
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Originally Posted by toyotaman7
You have the wire, but likely no power. There is a converter box inside under the passenger side luggage compartment trim that is likely missing. You also do not have a transmission and engine oil cooler. I would not tow without a transmission cooler.
How would i tell if there is power? What would i be looking for in the compartment?
Old 05-02-16, 06:14 PM
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Originally Posted by daveylin
How would i tell if there is power? What would i be looking for in the compartment?
You should have a tow fuse if it is wired. Check the manual for the position of that fuse and check to see if there is a fuse there. You should also be able to check the voltage with a volt meter. With your lights on you should be able to read 12v across at least two of the wires.

Or just check with your dealer, might be safer and easier.
Old 05-02-16, 06:21 PM
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Originally Posted by toyotaman7
You should have a tow fuse if it is wired. Check the manual for the position of that fuse and check to see if there is a fuse there. You should also be able to check the voltage with a volt meter. With your lights on you should be able to read 12v across at least two of the wires.

Or just check with your dealer, might be safer and easier.
Wow you are right, the manual says its not recommened for towing or even putting a tow hitch to hold a bicycle. I just wanted to either put that or at most tow a little aluminum boat to go lake fishing with... damnit.
Old 05-04-16, 08:24 PM
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cec327
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Originally Posted by daveylin
Wow you are right, the manual says its not recommened for towing or even putting a tow hitch to hold a bicycle. I just wanted to either put that or at most tow a little aluminum boat to go lake fishing with... damnit.
I read about the bike rack also. I have a hard time believing that a towing pkg. is needed for a bike rack that fit into the hitch receiver. I put a hitch on my 2016 rx 350 for a bike rack and will use it. The tow hitch is bolted in the same place -- with or without the towing pkg.
Perhaps Lexus should advertise that the rx350 is not able to carry a bike on a bike rack that fit into the receiver.
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Old 05-05-16, 04:52 AM
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I am betting Lexus is worried about when you sell the vehicle and the new owner tows a boat instead of just using for a bike rack.

Lexus is just covering the bases.
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Old 05-05-16, 08:26 AM
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Yup I agree, and I dont understand why the old accords were able to tow at least 1000 to 2000 lbs and this cant tow anything at all?

I plan on towing max 1000 lbs, ill probably add an aftermarket trans cooler just to be safe, although my friend who worked at toyota/lexus for awhile said there is a integrated trans cooler already under the radiator. When I looked I did see some lines going to the bottom of the radiator that said AT-OIL... so sounds like there may be something already... although not as robust as the one that comes with the tow kit.
Old 05-05-16, 08:27 AM
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Originally Posted by RXOwner
I am betting Lexus is worried about when you sell the vehicle and the new owner tows a boat instead of just using for a bike rack.

Lexus is just covering the bases.
Perhaps but the new owner will have to wire the vehicle for lights in order to tow legally. I imagine that, to wire it correctly, would require a bit of expertise.
Old 05-05-16, 08:31 AM
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Originally Posted by cec327
Perhaps but the new owner will have to wire the vehicle for lights in order to tow legally. I imagine that, to wire it correctly, would require a bit of expertise.
The wiring actually seems in place, and i checked the fuse box and the tow fuse is also in place. I havent checked for power or if the converter is there though.


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